bairweb - 3-3a

Density Lab 2
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Time Length

Instructions

Everything except the triple beam balances will be put back at the end of class.
Make a new page on your wiki titled "3-3 Density Lab" and put your answers on it.
1. Make a table with 4 columns and a lot of rows (you can add more later if you need to)
  1. On the left describe the object
  2. In the second column write the mass
  3. In the third column write the volume
  4. In the fourth column write the density
  5. Round all answers to two decimals
End the lab with a description of how you calculated density.
Calculate the density of as many objects as you can in one class period.
1. If you finish your bag, get another (trade with other groups)
Use the notes below for help
If you find the Mystery Object with a density of 7.19 g/mL you get 10 bonus points
If you find the other Mystery Object with a density of 9.21 g/mL you get 5 bonus points.
You may only get one of the bonuses

Notes
read these notes to know how to calculate density.
Density of Irregularly Shaped Objects

Calculate the mass in grams with the triple beam balance
- Calculate to the nearest hundredth (estimate between the lines)
  - Example 234.43 g
Calculate the volume in mL by displacement in a graduated cylinder (dropping things in water)
- Put an amount of water in a graduated cylinder that will submerge the object completely
- Note the original volume
- Drop the object in
- Note the new volume (take the reading from the bottom of the meniscus )
- Calculate to the nearest tenth (estimate between the lines)
  - Example 43.3 mL
D=m/v
- (unit is g/mL)
- Round to 2 decimals)

Density of Regularly Shaped Objects

Calculate the mass the same as before
Calculate the volume using the equation LxWxH
- Measure in cm
- Calculate to the nearest tenth (estimate between the lines)
- Example 9.4 cm
Calculate the density the same as before